What kind of weather system can cause sandstorms?

Weak dust weather is generally only caused by local heat and low pressure, with little influence, little movement and weak intensity. However, for strong sandstorm weather, such as sandstorm, strong sandstorm and black storm (the strongest level of sandstorm with visibility of 0 m), in addition to local geothermal depression, it is often caused by the rapid southward movement of cold front; Black storm is a particularly strong sandstorm, which is often caused by squall line, which is also a mesoscale weather system caused by the interaction of hot low pressure and cold front. Like the usual squall line, the dry squall line also has strong convection, but the difference is that the dry squall line cannot have a thunderstorm cloud as tall as the squall line because of its very little water vapor content.

The atmospheric stratification in sandstorms is often unstable, but the water vapor content is low, so it is difficult to form clouds and cause rainfall. Generally speaking, the stronger the cold front, the more unstable the atmospheric stratification and the stronger the sandstorm.